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Update Samsung Galaxy S3 I9300 to Android 4.2.1 Jelly Bean Leaked JOP40D Firmware (XXUMFB3)

Android 4.2.1 Jelly Bean has been leaked for the Samsung Galaxy S3 and it is fully functional. You can use this guide to learn how to successfully flash the JOP40D firmware on your I9300 device. Read the entire post and you should be able to complete the tutorial in under 5 minutes.

SAMSUNG continues to test the Android 4.2.1 Jelly Bean and now a leak confirm that the official release date isn’t very far away and Galaxy S3 users will get it in the next month. The new firmware update brings several new features such as Daydream ‘screensaver’, Improved Ripple effect on Lockscreen, a brand new Android 4.2.1 lockscreen with support for widgets, improved Notification Center, Voice Command which is supported for almost all the parts of the I9300 device. Also, you will get better stability and multiple other tweaks that should improve the overall performance of your device.

In order to successfully install this Android 4.2.1 Jelly Bean JOP40D leaked firmware, read the following guidelines first:

  • Use this tutorial only for the Samsung Galaxy S3 model number I9300. You shouldn’t attempt to flash this new Update file on any other Android device.
  • The firmware version of this ROM is JOP40D, while its PDA is set to I9300XXUFMB3 and it was leaked in Middle East for the first time.
  • It will work for any device, but you should note that this update will revoke any root access. However, your device will have its binary counter increased and the phone status will be changed to ‘modified’. There is no new modem in this release, which means that the modem will remain the same.
  • Make sure that your computer has the Samsung USB drivers installed on it.
  • Disable Samsung KIES as it shouldn’t run while you’re using ODIN Windows app to flash this leaked Jelly Bean firmware.
  • Disable antivirus applications that are currently opened on your computer.
  • Backup all your data by moving it on your phone’s internal SDcard. Also, you can choose to store it on your phone’s external SDcard or on your computer.
  • This is not an official release by Samsung and you should expect to find bugs or errors while using it.
  • You cannot blame us in case you brick your device or you lose any important data files in the process.
  • Read the entire article and you shouldn’t have any problems completing the update.
  • Make sure that your device’s battery is charged so that the power levels are over 50%. This will prevent the phone from powering off in the middle of the updating process.
  • In case you’re hitting any roadblocks, then you should ask for more help in the comments section. I will try to come up with a viable solution.

These were the guidelines that you had to go over before getting to the tutorial. Make sure that you won’t skip any steps that I have listed below.

How to update Samsung Galaxy S3 I9300 to leaked Android 4.2.1 Jelly Bean JOP40D firmware:

  1. Download the I9300XXUFMB3 firmware zip from HERE. Save the file on your PC and then extract its contents to a single folder.
  2. Download ODIN 3.04 from HERE. Extract the ODIN files on your PC desktop and then get to the next step.
  3. Power off your smartphone now.
  4. Go to Odin folder and launch the Odin executable.
  5. Next, boot your device into Download Mode by pressing at the same time Volume Down, Home and Power. A menu will appear and you have to release those buttons and then press Volume Up to confirm Download Mode.
  6. Connect your Galaxy S3 to your computer.
  7. ODIN should say ‘Added!!’ and this means that you can move to the next step. NOTE: If the ‘Added!!’ alert doesn’t appear then you should change the USB port or you can choose to reinstall the Samsung USB drivers. Return to the tutorial when Odin recognizes your phone.
  8. Next, press the ‘PDA’ button in ODIN.
  9. Browse for the ‘I9300XXUFMB3_I9300OJKFMB3_HOME.tar.md5’ file and load it into Odin. NOTE: make sure that the Re-partition option is disabled. Don’t edit any other default settings.
  10. When you’re ready, click the START button and wait until the Android 4.2.1 Jelly Bean firmware is installed on your Galaxy S3.
  11. After the update is installed your device will reboot and when the Samsung boot animation appears you can unplug the phone from PC. ODIN will display the ‘PASS’ alert which means that the update was completed successfully.
  12. That’s it, you’ve managed to successfully flash the latest Android 4.2.1 JOP40D Jelly Bean leaked firmware for the Samsung Galaxy S3.

NOTE: If ODIN freezes or it displays the ‘FAIL’ alert, then you will have to unplug the phone from PC, close ODIN and then power off the smartphone by removing its battery. Re-insert the battery after 5 seconds have passed and then you should launch again ODIN on your computer. After that you will have to repeat the entire process once again. However, make sure that you take a second look over the ‘preparation guide’, which is listed above this tutorial.

NOTE 2: In case Odin displays the ‘PASS’ alert but the phone is unable to boot, and it gets stuck in boot loop or it freezes, then you will be forced to wipe data and factory reset your smartphone using the Recovery mode. This will wipe all the installed apps, SMS and other data from your device, but it will force your device to boot into normal mode. Here’s how to boot into Recovery Mode:

  • Power off your device completely by removing its battery.
  • Re-insert the battery after 5 seconds and then boot your phone into Recovery mode. It can be done by pressing at the same time Volume Up, Home and Power.
  • Select ‘wipe data/ factory reset’ option from the main menu of Recovery mode.
  • Confirm the factory reset.
  • After the process is complete you should select ‘reboot system now’.
  • Wait until the Galaxy S3 boots into normal mode.
  • Test the new ROM

If the Android 4.2.1 leaked firmware installs successfully but you experience any force closes or the device powers off without notice, then you will have to apply the ‘factory reset’ steps listed above.

These were all the instructions that you had to go over in order to flash the leaked Android 4.2.1 JOP40D Jelly Bean firmware for the Samsung Galaxy S3 I9300.

In case you’re having any other problems, then you should ask for more help in comments. Make sure to leave a detailed comment, so that I will be able to come up with a viable solution for any problems that you might stumble while attempting to flash a new firmware update for your phone.

Those of you who want to install the rooted variant of this Leaked Android 4.2.1 ROM should follow the instructions in this guide HERE.

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